If I login a project on the website you get de navigation bar. If you klick on “Files” your going to files but if you klick on all the others (Activity, Messages, To-do List, Milestones, and Settings) your going out of the project. If you look closer to the hyper link you see bij files :
“http://www.gh-projecten.nl/lopendeprojecten/test-project?project_id=111&tab=files&action=index”
and bij the others:
“http://www.gh-projecten.nl/lopendeprojecten?project_id=111&tab=message&action=index”
There i'm missing the name off the project in the hyperlink.

The hyperlinks 1,5 and 6 are working with the Frontend plug-inn but the hyperlinks 2,3 and 4 not.
You can see the differants between the ones that work and don't, the name off the project is not in the hyperlink.
Hou van i fixed this ?